@misc{indiciaea78f4cf0452f,
  title = {Geologic map of the Wadi As Sirhan quadrangle, Kingdom of Saudi Arabia},
  author = {Richard A. Bramkamp and Glen F. Brown and Donald A. Holm and Newton M. Layne},
  year = {1963},
  doi = {10.3133/i200a},
  url = {https://pubs.usgs.gov/publication/i200A},
  note = {Source identifier: i200A}
}